This protozoan infection is caused by a species of trichomonas often associated with a mucoid (and occasionally bloody) diarrhea in puppies. Commonly, it is found in association with poor kennel sanitation. Prolonged infection leads to weak, debilitated, stunted puppies with rough coats. The diagnosis is made by finding protozoan cysts in fresh stool.
Treatment: The infection responds well to Flagyl (metronidazole).